02GF74
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| posted on 6/10/08 at 11:15 AM |
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monday's silly question - using bike disc brakes
Here is the idea. Fit motorcycle discs and calipers to cortina uprights.
Looking at ebay, calipers are about 1/3 rd price of willwoods but discs are alsmnot same price.
It will save a fair bit of weight over the cortina discs, look really bling but...
a) will they be man enough? (westfield do sell thinner cortina discs)
b) can they be made to fit at reasoable costs?
c) will having floating disc be a problem
d) will there be problem with getting matching master cylinder?
anyone tried this or consdiered dfoing this?
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Richard Quinn
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| posted on 6/10/08 at 11:24 AM |
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Yes, being an ex-Autograss racer, I have considered it. They may well be up to it as you can now get nice Tokico 6 pots etc. Most of the newer ones
are radial mount which could cause a few issues with mounting. Lug mount may be an issue with having to make up adaptors for the Cortina uprights. One
thing I would say is have a look at the price of pads (they're not cheap) and bank on replacing pads and discs more often. I've gone with
Wilwoods!
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MikeRJ
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| posted on 6/10/08 at 11:28 AM |
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I supposed you'd have to look at how heavy your car is in relation to a superbike. Most (all?) modern superbikes are well under 200kg, even a
lightweight locost is going to be double that.
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Mr Whippy
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| posted on 6/10/08 at 11:34 AM |
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quote:
Originally posted by MikeRJ
I supposed you'd have to look at how heavy your car is in relation to a superbike. Most (all?) modern superbikes are well under 200kg, even a
lightweight locost is going to be double that.
then again I remember quite clearly just how bad my cortina brakes were 
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will121
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| posted on 6/10/08 at 11:49 AM |
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the use of motorbike 4 and 6 pot calipers has been done as some can be split and respaced to suit various disk thickness, but would think using
motorbike disks a non starter on the basis of braked weight diferance
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Peteff
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| posted on 6/10/08 at 11:52 AM |
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quote:
Originally posted by Mr Whippythen again I remember quite clearly just how bad my cortina brakes were
That was on something twice as heavy as a Locost, they are perfectly adequate even without the servo and will lock the fronts easily if you get
carried away.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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loggyboy
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| posted on 6/10/08 at 12:27 PM |
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quote:
Originally posted by MikeRJ
I supposed you'd have to look at how heavy your car is in relation to a superbike. Most (all?) modern superbikes are well under 200kg, even a
lightweight locost is going to be double that.
But bikes have 1 disc and a car would have 2.
However despite that, IMO i wouldnt want to risk it for a few hungreds of grams maybe a 1kg or 2 of weight saving, coupled with some cost saving too.
Budget remould tyres are cheaper, but as with tyres, brakes are somewhere i wouldnt want to scrimp n save.
[Edited on 6/10/08 by loggyboy]
Mistral Motorsport
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rayward
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| posted on 6/10/08 at 01:01 PM |
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But bikes have 1 disc and a car would have 2.
most (prob all?)sportsbikes have 2 discs anyway
Ray
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r1_pete
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| posted on 6/10/08 at 01:04 PM |
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quote:
Originally posted by rayward
But bikes have 1 disc and a car would have 2.
most (prob all?)sportsbikes have 2 discs anyway
Ray
They sure do, I think the big problem would be the speed of pad wear, compared to cars there is very little meat on bike pads.
[Edited on 6/10/08 by r1_pete]
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Richard Quinn
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| posted on 6/10/08 at 01:15 PM |
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... and as I said before, the pads are tiny but very expensive!
I think that the thinner discs would also get a little warm so warpage could be an issue
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02GF74
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| posted on 6/10/08 at 01:23 PM |
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quote:
Originally posted by Richard Quinn
... and as I said before, the pads are tiny but very expensive!
I think that the thinner discs would also get a little warm so warpage could be an issue
warpage - that is why they are floating. 
I reckon they are more than big enough to halt a locost but the thinness means there is less mass so they will heat up if used under lost of heavy
braking. As they will not be in open air as on a bike, this is probalby the main drawback.
I also wonder if the large disc will fit inside a car wheel.
oh well, back to the drawing board....
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tomgregory2000
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| posted on 6/10/08 at 02:34 PM |
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motorbike discs do warp as mine have on my VTR1000 and it gets quite intresting braking at a ton plus, also the brakes on a bike dont get used that
much because there is so much engine braking and the heat build up if used on a car would be extreme
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Richard Quinn
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| posted on 6/10/08 at 03:02 PM |
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quote:
Originally posted by tomgregory2000
also the brakes on a bike dont get used that much because there is so much engine braking
Get a slipper clutch and see how good your brakes
really are(n't)??
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dinosaurjuice
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| posted on 6/10/08 at 03:24 PM |
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I was hoping somebody would start a topic about this. Ive got a Mev Rocket, and being mid engined i was thinking some 6, or even 4, pot big-bike
brakes would be ample on the front.
Aftermarket wavey discs might be an answer to heat build up, not sure how much difference they make though.
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Richard Quinn
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| posted on 6/10/08 at 03:32 PM |
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The other thing to bear in mind is that getting bike calipers etc under a 13" rim is going to be a no goer. I think you would need 15" as
a minimum.
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dinosaurjuice
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| posted on 6/10/08 at 03:39 PM |
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my rocket runs 17's...im getting really tempted by this now. i should have taken up the offer of a student loan afterall 
for wheels 14" and under....what about quad bike discs?
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MikeRJ
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| posted on 6/10/08 at 03:53 PM |
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quote:
Originally posted by dinosaurjuice
Aftermarket wavey discs might be an answer to heat build up, not sure how much difference they make though.
None, wavey discs are a fashion accessory!
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